Exhaust Fitting Kits

Exhaust adaptor. To be used when installing 3.6L 964/993 engine into G-model cars and still using "banana" style exhaust boxes.

Fits:
Porsche 911 G model with 3.6 L engine 2.7-3.2L 08/1973-07/1989

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

1620650200

The product you are viewing cross references to these numbers

Mounting Kit For Exhaust.

The Porsche Exhaust Mounting Kit – OE Match (Part Number: PCG91121100/1) is a replacement fitting and fastening kit designed to securely install and support the exhaust heat exchangers on selected classic Porsche 911 models.

Fits:

• Porsche 911 2.7L / 3.0L / *3.2L 08/73-07/85

*If used with 1984 onwards 3.2L you may need 6x 93011119112/1 42mm bore Manifold gaskets 

Designed as an alternative to the original Porsche exhaust mounting kit, this OE Match replacement provides the necessary mounting hardware for correctly securing compatible exhaust components, helping maintain a stable installation and reliable sealing at the exhaust connections.

The exhaust mounting system operates in an extremely demanding environment, exposed to high temperatures, constant engine vibration, moisture and road contamination. Over time, original mounting bolts, nuts, studs and other fastening components can become corroded, weakened, seized or damaged during exhaust removal.

Replacing worn or deteriorated exhaust mounting hardware helps maintain secure exhaust connections, minimise unwanted vibration and reduce the likelihood of exhaust gas leaks.

Ideal for exhaust system repairs, heat exchanger replacement, engine maintenance and classic Porsche restoration projects, this OE Match mounting kit offers a practical and cost-effective alternative to Genuine Porsche-branded mounting hardware.

What This Product Does:
The exhaust mounting kit provides the fastening components required to securely attach compatible exhaust heat exchangers and associated exhaust components to the engine.

Correctly installed exhaust mounting hardware maintains the clamping force required for secure connections and effective sealing between the exhaust components and the cylinder heads.

Its main functions include:

• Securing exhaust components: Provides the mounting hardware needed to correctly fasten heat exchangers and associated exhaust fittings.
• Maintaining exhaust joint sealing: Helps apply consistent clamping pressure to the exhaust gaskets, reducing the risk of exhaust gas leakage.
• Supporting exhaust system stability: Keeps exhaust components correctly positioned during engine operation.
• Reducing vibration and rattling: Helps prevent unwanted movement caused by loose or deteriorated fasteners.
• Withstanding high operating temperatures: Provides mounting hardware suitable for the demanding thermal conditions surrounding the exhaust system.
• Supporting reliable exhaust performance: Maintains secure exhaust connections for effective exhaust gas flow.
• Facilitating exhaust repairs: Provides replacement fastening components during heat exchanger installation, exhaust maintenance or engine restoration.

Symptoms Of Wear Or Failure:
Exhaust mounting hardware is continually subjected to extreme temperatures, repeated heating and cooling cycles, engine vibration and exposure to moisture. These conditions can cause corrosion, metal fatigue, loosening or seizure over time.

Common signs of worn or damaged exhaust mounting components include:

• Corroded or rusted fasteners: Exhaust mounting nuts, bolts and studs may become heavily corroded, reducing their strength and making removal difficult.
• Loose exhaust components: Deteriorated or incorrectly tightened hardware may allow movement around the heat exchanger or exhaust connections.
• Exhaust gas leaks: Damaged or loose fasteners can reduce gasket clamping pressure, allowing exhaust gases to escape from the joints.
• Increased exhaust noise: Leaking exhaust connections may produce ticking, blowing or hissing sounds, particularly during acceleration or when the engine is cold.
• Rattling or vibration: Loose mounting components may allow the exhaust system to vibrate excessively, producing unwanted metallic noises.
• Broken or missing mounting hardware: Heat exposure, corrosion or mechanical stress may cause mounting studs or bolts to fracture.
• Exhaust fumes or unusual odours: Leaking exhaust joints may allow exhaust gases to escape into the surrounding engine area.
• Difficulty removing exhaust components: Severely corroded or seized mounting hardware may complicate routine servicing and heat exchanger replacement.

Why Replacement Matters:
Replacing deteriorated exhaust mounting hardware is important for maintaining the structural integrity, sealing performance and long-term reliability of the Porsche 911 exhaust system.

Old or corroded mounting components may no longer provide the correct clamping force required to keep exhaust connections secure. This can result in exhaust gas leaks, excessive vibration, rattling and potential damage to surrounding components.

Severely corroded hardware may also break during removal, making future exhaust repairs more difficult and time-consuming.

Installing a replacement OE Match Exhaust Mounting Kit helps to:

• Restore secure exhaust installation: Ensure compatible heat exchangers and exhaust components are correctly fastened.
• Help prevent exhaust leaks: Maintain appropriate gasket clamping pressure for reliable sealing.
• Reduce unwanted vibration: Minimise rattling and movement caused by loose or weakened mounting hardware.
• Improve exhaust system reliability: Replace aged, corroded or damaged fasteners before they cause further problems.
• Support safe vehicle operation: Help reduce the risk of exhaust gases escaping through poorly secured connections.
• Simplify exhaust maintenance: Provide replacement mounting hardware when removing and refitting heat exchangers.
• Protect surrounding components: Reduce the risk of excessive movement or stress on adjacent exhaust components.
• Support classic Porsche restoration: Restore the intended exhaust mounting arrangement during engine rebuilding or vehicle refurbishment.
• Offer a cost-effective repair: Provide an OE Match alternative to the Genuine Porsche mounting kit.

Replacing exhaust mounting hardware during heat exchanger replacement or major exhaust servicing is recommended, particularly when existing fasteners show signs of corrosion, damage or deterioration.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

PCG91121100

The product you are viewing cross references to these numbers

Mounting Kit for one Heat Exchanger 
2 required per car

Restore the security and reliability of your Porsche exhaust system with this OE Match Heat Exchanger Mounting Kit, designed specifically for the Porsche 911 3.2 Carrera (1984–1989) and the 930 turbo (1984-1989). Manufactured to original equipment specifications, this comprehensive fitting kit contains the essential hardware required to securely install the heat exchangers, ensuring correct alignment, reliable sealing and long-lasting durability.

Fits:

• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1978-1989 3.3L Turbo (930)

Kit included:
1x Large gasket for mounting heat exchanger to intermediate tube
3x Gasket for heat exchanger to cylinder head. 3 pcs. required for each heat exchanger
3x Bolt, M8x1.25x40mm
3x Nut M8x1.25, for mounting heat exchanger to cylinder head
3x Lock nut, M8x1.25, cu. Plated
3x Nut, M8x1.25

 Whether you're replacing tired heat exchangers, installing a new exhaust system or carrying out a concours-quality restoration, fitting new mounting hardware ensures every component is correctly secured while reducing the risk of vibration, exhaust leaks and premature hardware failure.

What Does the Heat Exchanger Mounting Kit Do?

The heat exchanger mounting kit provides the fixings needed to attach the heat exchangers securely to the engine and exhaust system. It plays an important role by:

• Securing the heat exchangers to the engine.
• Maintaining correct exhaust alignment.
• Supporting efficient cabin heating performance.
• Reducing vibration and unwanted movement.
• Helping maintain leak-free exhaust joints.
• Allowing for normal expansion and contraction as exhaust temperatures change.

Correct mounting hardware is essential for maintaining both exhaust efficiency and the performance of the Porsche heating system.

Why Do Heat Exchanger Mounting Kits Fail?

The mounting hardware operates in an extremely demanding environment, exposed to continuous heat, moisture and vibration. Over time, components can fail due to:

• Corrosion caused by road salt and moisture.
• Heat cycles weakening fasteners.
• Rusted or seized nuts and bolts.
• Fatigue caused by engine vibration.
• Damage during previous exhaust repairs.
• Age-related deterioration after decades of service.

As the hardware deteriorates, the heat exchangers can loosen, resulting in exhaust leaks, rattles, poor alignment and additional stress on surrounding components.

When Should the Heat Exchanger Mounting Kit Be Replaced?

The mounting hardware should be inspected whenever the exhaust or heat exchangers are removed. Replacement is recommended if you notice:
Rusted or seized fasteners.

• Broken or stretched hardware.
• Loose heat exchangers.
• Exhaust leaks around mounting flanges.
• Excessive vibration or rattling.
• Damaged washers, locking plates or mounting brackets.

Most Porsche specialists recommend fitting a new mounting kit whenever new heat exchangers are installed, ensuring reliable installation and avoiding the reuse of weakened or corroded fixings.

Mounting Kit For Pre-Silencer / Intermediate Exhaust.
The OE Match Mounting Kit for Pre-Silencer / Intermediate Exhaust is a comprehensive installation kit designed to provide all the essential hardware required when fitting or replacing the pre-silencer or intermediate exhaust section on compatible Porsche models. Manufactured to OE specifications for fit, strength and durability, this kit ensures secure installation, correct alignment and reliable sealing of exhaust components.  

Kit Includes:
1x Large gasket for mounting heat exchanger to intermediate tube
1x Gasket for rear exhaust to intermediate, exhaust
1x Gasket
9x Bolt, M8x1.25x40mm
9x Lock nut, M8x1.25, cu. plated

Fits:

• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50  

The kit typically includes high-quality fasteners, clamps, nuts, bolts, washers and sealing hardware where applicable, all manufactured from corrosion-resistant materials capable of withstanding the extreme temperatures and harsh operating conditions of the exhaust system. It is the ideal solution when replacing worn or corroded original fittings during exhaust repairs or upgrades.  

What This Product Does:

• Provides the essential hardware required for pre-silencer or intermediate exhaust installation.
• Secures exhaust components safely and correctly.
• Maintains proper exhaust alignment.
• Helps create leak-free exhaust connections.
• Replaces worn, seized or corroded original mounting hardware.
• Reduces vibration and movement within the exhaust system.
• Simplifies exhaust servicing and installation.
• Forms an essential part of a professional exhaust repair or replacement.

Symptoms Of Wear Or Failure:

• Exhaust blowing or gas leaks.
• Loose or misaligned exhaust components.
• Rattling or knocking noises from the exhaust system.
• Corroded or seized nuts, bolts or clamps.
• Broken or missing fixing hardware.
• Increased exhaust vibration.
• Difficulty securing replacement exhaust components.
• Premature gasket wear caused by loose joints.
• Excessive exhaust movement during driving.
• Visible rust or deterioration of mounting components.

Why Replacement Matters:

• Exhaust mounting hardware is continuously exposed to extreme temperatures, moisture, road salt and vibration. Over time, these conditions can cause fasteners to corrode, seize or lose their clamping force, making it difficult to achieve a secure and leak-free installation when replacing exhaust components.
• Reusing old hardware may result in poor alignment, exhaust leaks, unwanted vibration and premature failure of newly installed exhaust parts. Damaged or weakened fixings can also make future servicing more difficult and increase the likelihood of broken studs or seized fasteners.
• Replacing all associated mounting hardware during exhaust repairs ensures a secure installation and helps maximise the lifespan of the exhaust system. The OE Match Mounting Kit provides factory-style fitment, durable corrosion-resistant components and dependable long-term performance, helping maintain the reliability, refinement and performance expected from your Porsche.